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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6083d28a97608c382b7d7d02f21c2e10d7cc5905ad1acd05b147cfc3ec2d47dc' 
  AND token = 'pp948w0wZkFUWzbLOndMOaTxwOy5+B4aODEEYjDz5kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}